B.S. 1640 : Part 2 : 1962 : Specification for steel butt - welding pipe fittings for the petroleum industry Part 2. wrought and cast austenitic chromium- nickel steel fittings
- London British Standard Institution
STD419
B.S. 1640 : Part 2 : 1962
STD419
B.S. 1640 : Part 2 : 1962